v3.26.1
Fair value measurements - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions
Jun. 28, 2026
Dec. 28, 2025
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities - Estimated Fair Value $ 5,360 $ 2,854
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 20,422 19,709
Marketable securities 336 393
Total cash, cash equivalents and current marketable securities, Carrying Amount 20,758  
Total cash, cash equivalents and current marketable securities, Estimated Fair Value 20,758  
Excess of carrying value over fair value of debt   $ 1,700
Held-to-maturity Securities    
Debt Securities, Held-to-maturity [Abstract]    
Held-to-maturity Securities - Carrying Amount 15,398  
Held-to-maturity Securities - Estimated Fair Value 15,398  
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 15,382  
Marketable securities 16  
Held-to-maturity Securities | Cash    
Debt Securities, Held-to-maturity [Abstract]    
Held-to-maturity Securities - Carrying Amount 3,235  
Held-to-maturity Securities - Estimated Fair Value 3,235  
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 3,235  
Marketable securities 0  
Held-to-maturity Securities | Non-U.S. sovereign securities    
Debt Securities, Held-to-maturity [Abstract]    
Held-to-maturity Securities - Carrying Amount 16  
Held-to-maturity Securities - Estimated Fair Value 16  
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 0  
Marketable securities 16  
Held-to-maturity Securities | U.S. reverse repurchase agreements    
Debt Securities, Held-to-maturity [Abstract]    
Held-to-maturity Securities - Carrying Amount 6,626  
Held-to-maturity Securities - Estimated Fair Value 6,626  
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 6,626  
Marketable securities 0  
Held-to-maturity Securities | Money market funds    
Debt Securities, Held-to-maturity [Abstract]    
Held-to-maturity Securities - Carrying Amount 4,749  
Held-to-maturity Securities - Estimated Fair Value 4,749  
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 4,749  
Marketable securities 0  
Held-to-maturity Securities | Time deposits(1)    
Debt Securities, Held-to-maturity [Abstract]    
Held-to-maturity Securities - Carrying Amount 772  
Held-to-maturity Securities - Estimated Fair Value 772  
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 772  
Marketable securities 0  
Available-for-sale Securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities - Carrying Amount 5,360  
Available-for-sale Securities - Estimated Fair Value 5,360  
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 5,040  
Marketable securities 320  
Available-for-sale Securities | U.S. Gov’t securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities - Carrying Amount 4,908  
Available-for-sale Securities - Estimated Fair Value 4,908  
Available-for-sale Securities | Non-U.S. sovereign securities    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities - Carrying Amount 224  
Available-for-sale Securities - Estimated Fair Value 224  
Available-for-sale Securities | Corporate debt securities(1)    
Debt Securities, Available-for-sale [Abstract]    
Available-for-sale Securities - Carrying Amount 228  
Available-for-sale Securities - Estimated Fair Value 228  
Available-for-sale Securities | Non-U.S. sovereign securities    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 95  
Marketable securities 129  
Available-for-sale Securities | Corporate debt securities(1)    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 51  
Marketable securities 177  
Available-for-sale Securities | U.S. Gov’t securities    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Cash and Cash Equivalents 4,894  
Marketable securities $ 14